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Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from the emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules.
Apr 10, 2022 · Explain how emission line spectra and absorption line spectra are formed; Describe what ions are and how they are formed; Explain how spectral lines and ionization levels in a gas can help us determine its temperature; We can use Bohr’s model of the atom to understand how spectral lines are formed.
Explain how emission line spectra and absorption line spectra are formed; Describe what ions are and how they are formed; Explain how spectral lines and ionization levels in a gas can help us determine its temperature; We can use Bohr’s model of the atom to understand how spectral lines are formed.
Learning Objectives. You will be able to distinguish between emission and absorption lines in a spectrum. You will know how spectral lines are produced. You will be able to calculate the energy/frequency/wavelength of a photon absorbed or emitted by a hydrogen atom.
A spectral line is like a fingerprint that can be used to identify the atoms, elements or molecules present in a star, galaxy or cloud of interstellar gas. If we separate the incoming light from a celestial source using a prism, we will often see a spectrum of colours crossed with discrete lines.
Learn why every element has a unique emission/absorption spectrum, and how we can use spectral lines to identify the composition of an object.
